When we are at Extreme Greed you need to be taking some profit off the table. Most people in crypto fail to keep the money they've made. They either sell too late or they selfishly watch all profits fall back to zero.
I've seen this happening each cycle.
We all need to understand that 1st priority in crypto is surviving. Profits are in 2nd place. Yes that sounds counterintuitive, but it's really simple. The real skill is not in making money. The real skill is in keeping it.
Lol...you are trying to advice regarding the market but you neglect the fact that the market is dynamic. This is why what you perceived as the trader's/investor's fault today could be what would deliver the huge money into their hands later tomorrow. This is why I do not like to generalize any advice when it is about trading and investment, but to advocate that traders should have a viable plan that will always guide them. In trading, it is not by force to use the stop loss or take profit functions, it is all about you and how you've trained yourself even though, those functions are good to use in the market.
Still, I have read a whole lot about trading/investment, thought enough people and have practised more than 100 trading and investment strategies to have concluded on what I just wrote. If you are a long-term trader/investor, there is no need to use take profit, though it is not a must you do not use it as well, it is all about your choice, your strategy or mere variants, and you will still be perfectly fine. All that matters is for the trader/investor to know the strengths and weaknesses of his strategy in relation to the market conditions, and also know the time he can dedicate to the market for effective management in some conditions.
And once you are very good at speculating, you will hardly miss your predictions and hardly go wrong when you leave a trade and not take your profit, or when you take profits void of regrets. This is why traders must build a foolproof and time-tested trading system with everything they know about the market to achieve their own style/pattern instead of believing that some actions are because of greed or fear, No, I won't take that. Trading/investment actions and plans can never be the same for all traders/investors.